39
Refrigerant Piping Connections
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Table 24: Total Space II Unit Refrigerant Charge.
Nominal Tons Model Number Refrigerant Charge (lbs.)
4.4 ARUN053GF2 7.7
See cautions for refrigerant leakage on pages 63-64
REFRIGERANT PIPING CONNECTIONS
Additional Refrigerant Charge
Calculating the additional refrigerant charge must also take into account piping length.
Additional Refrigerant Charge Formula:
Space II Unit Factory Refrigerant Charge (lbs.) + Additional Charge (lbs.) + Total Additional Refrigerant Amount (lbs.)
Where Additional Charge (lbs.) =
+ Total liquid piping length (feet) @ 7/8 inches x 0.237 lbs./ft.
+ Total liquid piping length (feet) @ 3/4 inches x 0.178 lbs./ft.
+ Total liquid piping length (feet) @ 5/8 inches x 0.116 lbs./ft.
+ Total liquid piping length (feet) @ 1/2 inches x 0.079 lbs./ft.
+ Total liquid piping length (feet) @ 3/8 inches x 0.041 lbs./ft.
+ Total liquid piping length (feet) @ 1/4 inches x 0.015 lbs./ft.
+ Correction Factor (CF) (lbs)
Example:
Additional Charge =
A (131 ft.) x 0.041 lbs./ft. (for 3/8 in. piping)
+ B (66 ft.) x 0.041 lbs./ft. (for 3/8 in. piping)
+ C (66 ft.) x 0.041 lbs./ft. (for 3/8 in. piping)
+ a+b+c+d+e (33 ft.+33 ft.+33 ft.+33 ft.+33 ft.) x 0.015 lbs./ft. (for 1/4 in. piping)
+ CF
= 5.37 (A) + 2.71 (B) + 2.71 (C) + 2.46 ([a+b+c+d+e] x 0.015) + 0 (CF) = 13.3
If the calculation results in a negative number, refrigerant does not need to be added.
A = 131 ft. @ 3/8 in.
B = 66 ft. @ 3/8 in.
C = 66 ft. @ 3/8 in.
X
b = 33 ft. @ 1/4 in.
a = 33 ft. @ 1/4 in.
c = 33 ft. @ 1/4 in. d = 33 ft. @ 1/4 in.
Space Unit
IDU IDU
IDUIDUIDU
Figure 39: Example of Additional Refrigerant Charge Calculation.
To Next Page
Loading...
